KR20230064452A - Display device - Google Patents

Abstract

A display device according to an exemplary embodiment of the present invention includes a substrate including a plurality of sub-pixels; an over-coating layer disposed on the substrate and including a base portion and a protruding portion; a first electrode disposed to cover the base portion and the protruding portion; a bank disposed on a portion of the first electrode; an organic layer disposed on the first electrode and the bank; and a second electrode disposed on the organic layer, wherein a distance between a side surface of the protrusion and a side surface of the bank is configured to be different for each of the plurality of sub-pixels.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device capable of improving a luminance viewing angle and a color viewing angle.

Currently, as we enter the information age in earnest, the field of display devices that visually display electrical information signals is rapidly developing, and research is continuing to develop performance such as thinning, lightening, and low power consumption for various display devices.

Among these various display devices, the light emitting display device is a self-emissive display device and, unlike a liquid crystal display device, does not require a separate light source, and thus can be manufactured in a lightweight and thin shape. In addition, the light emitting display device is not only advantageous in terms of power consumption due to low voltage driving, but also has excellent color implementation, response speed, viewing angle, and contrast ratio (CR), so it is expected to be used in various fields. there is.

An object to be solved by the present invention is to provide a display device capable of increasing light efficiency of an organic light emitting device and improving power consumption by using a side mirror-shaped anode.

Another object to be solved by the present invention is to provide a display device capable of improving a luminance viewing angle and a color viewing angle by differently setting a distance between a side surface of an overcoating layer and a side surface of a bank for each sub-pixel.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

A display device according to an exemplary embodiment of the present invention includes a substrate including a plurality of sub-pixels; an over-coating layer disposed on the substrate and including a base portion and a protruding portion; a first electrode disposed to cover the base portion and the protruding portion; a bank disposed on a portion of the first electrode; an organic layer disposed on the first electrode and the bank; and a second electrode disposed on the organic layer, wherein a distance between a side surface of the protrusion and a side surface of the bank is configured to be different for each of the plurality of sub-pixels.

A display device according to an exemplary embodiment of the present invention includes a substrate including a plurality of sub-pixels; an over-coating layer disposed on the substrate and including a base portion and a protruding portion; a first electrode disposed to cover the base portion and the protruding portion; a bank disposed on a portion of the first electrode; an organic layer disposed on the first electrode and the bank; and a second electrode disposed on the organic layer, wherein a width of the bank corresponding to a side surface of the protrusion is configured to be different for each of the plurality of sub-pixels.

A display device according to an exemplary embodiment of the present invention includes a substrate including a plurality of sub-pixels; an over-coating layer disposed on the substrate and having a concave portion; a first electrode disposed to cover the concave portion; a bank exposing a portion of the first electrode through an opening area; an organic layer disposed on the first electrode; and a second electrode disposed on the organic layer, wherein at least two of the plurality of sub-pixels have different values obtained by subtracting the width of the opening from the width of the concave.

Other embodiment specifics are included in the detailed description and drawings.

According to the present invention, the light extraction efficiency of the display device can be improved by using the side mirror-shaped anode.

According to the present invention, the luminance viewing angle and the color viewing angle can be improved by adjusting the width of the bank corresponding to the side surface of the protrusion of the overcoating layer for each sub-pixel.

Effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present invention.

1 is a plan view of a display device according to an exemplary embodiment of the present invention.
FIG. 2 is a cross-sectional view of the display device taken along line II-II′ of FIG. 1 .
FIG. 3 is a cross-sectional view of the display device taken along line III-III' of FIG. 1 .
4 is a schematic plan view of FIG. 3 .
5 is a graph showing a change in luminance according to a viewing angle.
6 is a cross-sectional view of a display device according to another exemplary embodiment of the present invention.
7 is a graph showing a change in luminance according to a viewing angle.
8 is a graph showing color shift according to a viewing angle.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different shapes, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, and the present invention is not limited thereto. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists', etc. mentioned in the present invention is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

When an element or layer is referred to as “on” another element or layer, it includes all cases where another element or layer is directly on top of another element or another layer or other element intervenes therebetween.

In addition, although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numbers designate like elements throughout the specification.

The area and thickness of each component shown in the drawings is shown for convenience of description, and the present invention is not necessarily limited to the area and thickness of the illustrated component.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship. may be

Hereinafter, the present invention will be described with reference to the drawings.

1 is a plan view of a display device according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view of the display device taken along line II-II′ of FIG. 1 .

Referring to FIGS. 1 and 2 , the display device 100 includes a substrate 110 , a transistor 120 , an overcoat layer 130 , a first light emitting element 140a and a bank 150 . The display device 100 may be implemented as a top emission type display device, but is not limited thereto.

The substrate 110 is a substrate for supporting and protecting various components of the display device 100 . The substrate 110 may be made of glass or a plastic material having flexibility. When the substrate 110 is made of a plastic material, it may be made of, for example, polyimide (PI). However, it is not limited thereto.

The substrate 110 includes a display area AA and a non-display area NA.

The display area AA is an area where an image is displayed on the display device 100, and a display element and various driving elements for driving the display element may be disposed in the display area AA. For example, the display device may include a first light emitting device 140a including a first electrode 141a, an organic layer 142a, and a second electrode 143a. In addition, various driving elements such as the transistor 120 for driving the display element, a capacitor, and wiring may be disposed in the display area AA.

A plurality of sub-pixels SP may be included in the display area AA. The sub-pixel SP is a minimum unit constituting a screen, and each of the plurality of sub-pixels SP may include a display element and a driving circuit. Each of the plurality of sub-pixels SP may emit light of different wavelengths. For example, the plurality of sub-pixels SP include a first sub-pixel SP1 emitting red light, a second sub-pixel SP2 emitting green light, and a third sub-pixel SP3 emitting blue light. can include The first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 may be sequentially arranged in the display area AA, but are not limited thereto. In addition, in FIG. 1 , the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 are shown to have the same area, but are not limited thereto. That is, the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 may have different areas. Also, in FIG. 1 , the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 are illustrated as having a square shape, but are not limited thereto. That is, the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 may be configured to have a circular or polygonal shape.

The driving circuit of the sub-pixel SP is a circuit for controlling driving of the display element. For example, the driving circuit may include driving elements such as the transistor 120 and a capacitor, but is not limited thereto.

The non-display area NA is an area in which an image is not displayed, and various components for driving a plurality of sub-pixels SP disposed in the display area AA may be disposed. For example, a driving IC supplying signals for driving the plurality of sub-pixels SP, a flexible film, and the like may be disposed.

As shown in FIG. 1 , the non-display area NA may be an area surrounding the display area AA. However, it is not limited thereto. For example, the non-display area NA may be an area extending from the display area AA.

Hereinafter, a first sub-pixel SP1 among a plurality of sub-pixels SP disposed in the display area AA will be described in more detail with reference to FIG. 2 .

A buffer layer 111 is disposed on the substrate 110 . The buffer layer 111 may serve to improve adhesion between the layers formed on the buffer layer 111 and the substrate 110 and block alkali components flowing out from the substrate 110 . The buffer layer 111 may be formed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or multiple layers of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto. The buffer layer 111 is not an essential component and may be omitted based on the type and material of the substrate 110, the structure and type of the transistor 120, and the like.

The transistor 120 is disposed on the buffer layer 111 . The transistor 120 may be used as a driving element for driving the first light emitting element 140a of the display area AA. The transistor 120 includes an active layer 121 , a gate electrode 122 , a source electrode 123 and a drain electrode 124 . The transistor 120 shown in FIG. 2 is a driving transistor and is a thin film transistor having a top gate structure in which a gate electrode 122 is disposed on an active layer 121 . However, it is not limited thereto, and the transistor 120 may be implemented as a transistor with a bottom gate structure.

The active layer 121 is disposed on the buffer layer 111 . The active layer 121 is a region where a channel is formed when the transistor 120 is driven. The active layer 121 may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or an organic semiconductor. there is.

A gate insulating layer 112 is disposed on the active layer 121 . The gate insulating layer 112 is a layer for electrically insulating the active layer 121 and the gate electrode 122 and may be made of an insulating material. For example, the gate insulating layer 112 may be formed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or multiple layers of silicon nitride (SiNx) or silicon oxide (SiOx). It is not limited.

A contact hole through which the source electrode 123 and the drain electrode 124 respectively contact the source and drain regions of the active layer 121 is formed in the gate insulating layer 112 . The gate insulating layer 112 may be formed over the entire surface of the substrate 110 as shown in FIG. 2 or may be patterned to have the same width as the gate electrode 122, but is not limited thereto.

The gate electrode 122 is disposed on the gate insulating layer 112 . The gate electrode 122 is disposed on the gate insulating layer 112 to overlap the channel region of the active layer 121 . The gate electrode 122 is made of various metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and It may be any one of copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

An interlayer insulating layer 113 is disposed on the gate electrode 122 . The interlayer insulating layer 113 may be composed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx), or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto. . A contact hole through which the source electrode 123 and the drain electrode 124 respectively contact the source and drain regions of the active layer 121 is formed in the interlayer insulating layer 113 .

The source electrode 123 and the drain electrode 124 are disposed on the interlayer insulating layer 113 . The source electrode 123 and the drain electrode 124 are spaced apart from each other on the same layer. The source electrode 123 and the drain electrode 124 are electrically connected to the active layer 121 through contact holes of the gate insulating layer 112 and the interlayer insulating layer 113 . The source electrode 123 and the drain electrode 124 may be formed of various metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), It may be any one of neodymium (Nd) and copper (Cu), an alloy of two or more, or a multilayer thereof, but is not limited thereto.

Although only a driving transistor is shown in FIG. 2 among various transistors 120 included in the display device 100, other transistors such as switching transistors may also be disposed.

A passivation layer 114 is disposed on the source electrode 123 and the drain electrode 124 . The passivation layer 114 may electrically insulate and protect the transistor 120 and other components by covering the transistor 120 . A contact hole for exposing the drain electrode 124 of the transistor 120 is formed in the passivation layer 114 . In FIG. 2 , it is illustrated that a contact hole for exposing the drain electrode 124 is formed in the passivation layer 114 , but is not limited thereto. For example, a contact hole for exposing the source electrode 123 may be formed in the passivation layer 114 . The passivation layer 114 may be formed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multi-layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto.

An overcoat layer 130 is disposed on the passivation layer 114 . The overcoating layer 130 is an insulating layer for protecting the transistor 120 and planarizing an upper portion of the transistor 120 . A contact hole for exposing the drain electrode 124 of the transistor 120 is formed in the overcoating layer 130 . 2 shows that a contact hole for exposing the drain electrode 124 is formed in the overcoating layer 130, but is not limited thereto. For example, a contact hole for exposing the source electrode 123 may be formed in the overcoating layer 130 . The overcoating layer 130 is made of acrylic resin, epoxy resin, phenol resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, benzocyclobutene, and photoresist. It may be formed as one, but is not limited thereto.

The overcoating layer 130 includes a base portion 131 and a plurality of protrusions 132 . The base portion 131 and the plurality of protrusions 132 may be integrally formed as shown in FIG. 2 . For example, the base portion 131 and the plurality of protrusions 132 may be made of the same material and formed through the same process, eg, a mask process, but are not limited thereto.

The base portion 131 is disposed on the passivation layer 114 . The upper surface of the base part 131 has a plane parallel to the substrate 110 . Accordingly, the base portion 131 may flatten a level difference that may occur due to components disposed below.

A plurality of protrusions 132 are disposed on the base portion 131 . The plurality of protrusions 132 are integrally formed with the base portion 131 and have a shape protruding from the base portion 131 . The plurality of protrusions 132 may have a shape in which the upper surface is smaller than the lower surface, but is not limited thereto.

Each of the plurality of protrusions 132 includes a top surface and a side surface. The upper surface of the protrusion 132 is a surface located at the top of the protrusion 132 and may be a surface substantially parallel to the base portion 131 or the substrate 110 . A side surface of the protrusion 132 may be a first inclined surface SLO1 connecting the upper surface of the protrusion 132 and the base portion 131 . The first inclined surface SLO1 may have a shape inclined toward the base part 131 from the upper surface.

Meanwhile, a region of the overcoating layer 130 where the upper surface of the base portion 131 is exposed by the plurality of protrusions 132 may be defined as an opening region. Also, the opening area of the overcoating layer 130 may be defined as a concave portion. That is, the opening area of the overcoating layer 130 may have a concave shape by being composed of the upper surface of the base portion 131 and the first inclined surface SLO1 of the protruding portion 132 .

The first light emitting device 140a is disposed on the overcoating layer 130 . The first light emitting element 140a includes a first electrode 141a electrically connected to the drain electrode 124 of the transistor 120, an organic layer 142a disposed on the first electrode 141a, and an organic layer 142a. and a formed second electrode 143a. Here, the first light emitting device 140a may be a red light emitting device emitting red light.

The first electrode 141a is disposed in the concave portion of the overcoating layer 130 to correspond to each of the plurality of sub-pixels SP. The first electrode 141a is disposed to cover the base portion 131 and the plurality of protrusions 132 . Specifically, the first electrode 141a may be disposed on an upper surface of the base portion 131 on which the protruding portion 132 is not disposed and a side surface of the plurality of protruding portions 132 . That is, the first electrode 141a is disposed along the shape of the base portion 131 and the protruding portion 132 . Accordingly, the first electrode 141a may be configured to include a second inclined surface SLO2 corresponding to the first inclined surface SLO1. In addition, the first electrode 141a may be formed on some regions of upper surfaces of the plurality of protrusions 132 .

The first electrode 141a may be an anode of the first light emitting element 140a. The first electrode 141a may be electrically connected to the drain electrode 124 of the transistor 120 through a contact hole formed in the second overcoating layer 130 . However, the first electrode 141a may be electrically connected to the source electrode 123 of the transistor 120 depending on the type of transistor 120 and the design method of the driving circuit.

Although the first electrode 141a is illustrated as a single layer in FIG. 2 , the first electrode 141a may be formed of multiple layers. For example, the first electrode 141a may include a reflective layer for reflecting light emitted from the organic layer 142a toward the second electrode 143a and a transparent conductive layer for supplying holes to the organic layer 142a. .

The reflective layer may be disposed on the overcoating layer 130 to reflect light emitted from the first light emitting device 140a upward. The light generated in the organic layer 142a of the first light emitting device 140a may not only be emitted from the top, but may also be emitted from the side. Light emitted from the side is directed to the inside of the display device 100, may be trapped inside the display device 100 due to total internal reflection, and may further progress toward the inside of the display device 100 before being extinguished. Accordingly, the reflective layer may be disposed under the organic layer 142a to cover the first inclined surface SLO1, and change the traveling direction of light traveling to the side of the organic layer 142a to the front direction.

The reflective layer may be made of a metal material, such as aluminum (Al), silver (Ag), copper (Cu), magnesium-silver alloy (Mg:Ag), etc., but is not limited thereto no.

A transparent conductive layer is disposed on the reflective layer. The transparent conductive layer may be made of a conductive material having a high work function in order to supply holes to the organic layer 142a. For example, the transparent conductive layer may include indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), or zinc oxide (ZnO). ) and tin oxide (TO)-based transparent conductive oxide, but is not limited thereto.

The bank 150 is disposed on the overcoating layer 130 and the first electrode 141a. Bank 150 includes a top surface and a side surface. The upper surface of the bank 150 is a surface located at the top of the bank 150 and may be a surface substantially parallel to the substrate 110 . A side surface of the bank 150 may be a third inclined surface SLO3 connecting the upper surface of the bank 150 and the first electrode 141a. The third inclined surface SLO3 may correspond to the first inclined surface SLO1 and the second inclined surface SLO2 . The third inclined surface SLO3 may have an inclined shape from the upper surface toward the first electrode 141a.

The bank 150 may cover a portion of the first electrode 141a to define an open area and a non-open area. The opening area may refer to the first emission area EA1 in which light is substantially generated by the organic layer 142a in each of the plurality of sub-pixels SP. The bank 150 is not disposed in the first light emitting area EA1 and the organic layer 142a is directly positioned on the first electrode 141a to generate light. The non-opening area may refer to an area in which light is not generated where the bank 150 is disposed. However, the non-opening area may include a second light emitting area EA2 that does not generate light but reflects light so that the light is extracted to the front. The second emission area EA2 is a light reflection area and may correspond to an area corresponding to the first and second inclined surfaces SLO1 and SLO2. In the second light emitting area EA2, light emitted from the first light emitting element 140a to the side can be extracted to the front by the first electrode 141a disposed along the first inclined surface SLO2 of the protrusion 132. there is. In addition, the non-opening area is formed between the first non-emission area EA1 between the first light emitting area EA1 and the second light emitting area EA2 and the second light emitting area EA2 of the adjacent sub-pixel SP. 2 non-emission areas EA2 may be further included.

Meanwhile, according to the first light emitting area EA1 , the first non-emitting area NEA1 , the second light emitting area EA2 , and the second non-emitting area NEA2 , the first electrode 141a may have a first area and a second light emitting area NEA2. area and a third area. For example, the first region of the first electrode 141a may be a flat region disposed on the base portion 131 . The first area may contribute to light emission by corresponding to the first light emitting area EA1 and the first non-emitting area NEA1. The second area of the first electrode 141a may correspond to the first inclined surface SLO1 and may include the second inclined surface SLO2 . The second area may contribute to light reflection by corresponding to the second light emitting area EA2 . Since the first electrode 141a has a side mirror shape due to the second inclined surface SLO2 of the second region, light extraction efficiency of the display device 100 may be improved. The third region of the first electrode 141a may be a flat region disposed on the upper surface of the protrusion 132 . The third area may correspond to the second non-emission area NEA2. The first region, the second region, and the third region of the first electrode 141a may be deposited as one structure by the same process.

The bank 150 may be made of an organic material. For example, the bank 150 may be made of an organic material such as polyimide, acrylic, or benzocyclobutene-based resin, but is not limited thereto. That is, the bank 150 may be made of an inorganic material.

The organic layer 142a is disposed on the first electrode 141a and the bank 150 . For example, the organic layer 142a is disposed on the first electrode 141a in the first emission area EA1 and disposed on the bank 150 in the non-opening area. Specifically, the organic layer 142a may be disposed on the third inclined surface SLO3 of the bank 150 and a portion of the upper surface of the bank 150 in the non-opening area. The organic layer 142a may be disposed along the shape of the first electrode 141a and the bank 150 . The organic layer 142a may be patterned to correspond to each of the plurality of sub-pixels SP. The organic layer 142a may emit light of a specific color. Since the first sub-pixel SP1 of FIG. 2 is a red sub-pixel, the first light-emitting device 140a disposed in the first sub-pixel SP1 is a red light-emitting device, and the organic layer 142a emits red light. A light emitting layer may be included. In addition, the organic layer 142a may further include various layers such as a hole transport layer, a hole injection layer, a hole blocking layer, an electron injection layer, an electron blocking layer, and an electron transport layer.

The second electrode 143a is disposed on the organic layer 142a and the bank 150 . The second electrode 143a may be disposed along the shape of the organic layer 142a. The second electrode 143a may be formed of a common single layer corresponding to all of the plurality of sub-pixels SP. Since the second electrode 143a supplies electrons to the organic layer 142a, it may be made of a conductive material having a low work function. The second electrode 143a may be a cathode of the first light emitting element 140a. The second electrode 143a may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) or a metal alloy such as MgAg or a ytterbium (Yb) alloy. And, a metal doping layer may be further included, but is not limited thereto.

Meanwhile, although not shown in the drawings, an encapsulation portion may be formed on the first light emitting device 140a to protect the first light emitting device 140a, which is vulnerable to moisture, from being exposed to moisture. The encapsulation portion may block oxygen and moisture penetrating into the display device 100 from the outside. The encapsulation unit may have a structure in which an inorganic layer and an organic layer are alternately stacked, but is not limited thereto.

FIG. 3 is a cross-sectional view of the display device taken along line III-III' of FIG. 1 . 4 is a schematic plan view of FIG. 3 . In FIG. 4 , only the opening area by the protruding portion 132 and the opening area by the bank 150 of each of the plurality of sub-pixels SP1 , SP2 , and SP3 are briefly illustrated. In FIG. 4 , each opening area is illustrated as having a hexagonal shape, but the present invention is not limited thereto.

Referring to FIG. 3 , the plurality of sub-pixels SP includes a first sub-pixel SP1 , a second sub-pixel SP2 , and a third sub-pixel SP3 . The first sub-pixel SP1 includes red sub-pixels, the second sub-pixel SP2 includes green sub-pixels, and the third sub-pixel SP3 includes blue sub-pixels. Since each of the sub-pixels SP1 , SP2 , and SP3 has the same structure as the first sub-pixel SP shown in FIG. 2 except for emitting light of different colors, duplicate descriptions will be omitted.

The first sub-pixel SP1 includes a first light emitting element 140a that is a red light emitting element. The first light emitting device 140a may include a first electrode 141a, an organic layer 142a, and a second electrode 143a. Here, the organic layer 142a may include a red emission layer emitting red light.

The second sub-pixel SP2 includes a second light emitting element 140b that is a green light emitting element. The second light emitting device 140b may include a first electrode 141b, an organic layer 142b, and a second electrode 143b. Here, the organic layer 142b may include a green emission layer emitting green light.

The third sub-pixel SP3 includes a third light emitting element 140c that is a blue light emitting element. The third light emitting device 140c may include a first electrode 141c, an organic layer 142c, and a second electrode 143c. Here, the organic layer 142c may include a blue light emitting layer emitting blue light.

In the display device 100 according to an exemplary embodiment of the present invention, the light emitting elements 140a, 140b, and 140c of the plurality of sub-pixels SP1, SP2, and SP3 include side mirror-shaped anodes. That is, light trapped inside the display device is extracted to the outside by the side mirror-shaped first electrodes 141a, 141b, and 141c, thereby improving light extraction efficiency and improving power consumption.

In each of the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 , the distance between the side surface of the protrusion 132 and the side surface of the bank 150 may be configured to be different. Specifically, the distance between the first inclined surface SLO1 and the third inclined surface SLO2 may be configured differently for each of the plurality of sub-pixels SP1 , SP2 , and SP3 . For example, in the first sub-pixel SP1 , the first and third slope surfaces SLO1 and SLO2 may be spaced apart from each other by a first distance d1 . In the second sub-pixel SP2 , the first and third slope surfaces SLO1 and SLO2 may be spaced apart from each other by a second distance d2 . In the third sub-pixel SP3 , the first inclined surface SLO1 and the third inclined surface SLO2 may be spaced apart from each other by a third distance d3 .

Here, each of the distances d1 , d2 , and d3 may be a distance in a first direction parallel to the top surface of the substrate 110 . Also, each of the distances d1 , d2 , and d3 may mean the sum of the width of the first electrodes 141a , 141b , and 141c corresponding to the side of the protrusion 132 and the width of the bank 150 . That is, each of the distances d1, d2, and d3 is the width of the inclined region of the first electrodes 141a, 141b, and 141c disposed on the side of the protrusion 132 and the width of the first electrodes 141a, 141b, and 141c. It may be a value obtained by adding the width of the inclined region of the bank 150 covering the inclined region. Since the first electrodes 141a, 141b, and 141c have similar thicknesses and widths in the plurality of sub-pixels SP1, SP2, and SP3, the width of the inclined region of the bank 150 is equal to the plurality of sub-pixels SP1 and SP2. , SP3) may be configured differently from each other. Here, the widths of the first electrodes 141a, 141b, and 141c and the width of the bank 150 may also be the widths in the first direction.

The first distance d1 may be greater than the second distance d2 and the third distance d3. Also, the second distance d2 may be greater than the third distance d3. That is, among the first distance d1 , the second distance d2 , and the third distance d3 , the first distance d1 is the largest and the third distance d3 is the smallest. Also, the width of the inclined region of the bank 150 is the largest in the first sub-pixel SP1 and the smallest in the third sub-pixel SP3. In this case, the first distance d1 may be 2.5 μm or more. Also, the second distance d2 may be 1.5 μm to 2.5 μm. Also, the third distance d3 may be 1 μm to 2 μm.

By differentially designing the distances d1, d2, and d3 for each of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3, the luminance of each sub-pixel SP1, SP2, and SP3 The viewing angle and color viewing angle can be improved. Here, the luminance viewing angle means a luminance deviation according to a changing viewing angle, and the color viewing angle means a color change according to a changing viewing angle. Accordingly, when the luminance viewing angle is improved, the luminance deviation is minimized even when the viewing angle is changed, and side visibility may be improved. In particular, by differentially designing the distances d1 , d2 , and d3 for each sub-pixel SP1 , SP2 , and SP3 , occurrence of a color shift according to the viewing angle may be minimized and the color viewing angle may be improved.

Meanwhile, referring to FIGS. 3 and 4 , the width BWa of the opening area by the bank 150 in the first sub-pixel SP1 and the width BWa of the opening area by the bank 150 in the second sub-pixel SP2 The width BWb and the width BWc of the opening area by the bank 150 in the third sub-pixel SP3 may all be configured to be the same. Here, the opening area of the bank 150 may correspond to the first light emitting area EA1 of each sub-pixel SP1. That is, the widths BWa, BWb, and BWc of the first light emitting area EA1 of the plurality of sub-pixels SP1, SP2, and SP3 may all be the same. In this case, the widths OWa, OWb, and OWc of the concave portions of the overcoating layer 130 may be different for each of the plurality of sub-pixels SP1, SP2, and SP3. That is, the width OWa of the concave portion of the first sub-pixel SP1 is greater than the width OBw of the concave portion of the second sub-pixel SP2, and the width OWb of the concave portion of the second sub-pixel SP2 is It is larger than the width OWc of the concave portion of the 3 sub-pixels SP3.

However, the concave widths OWa, OWb, and OWc of the plurality of sub-pixels SP1, SP2, and SP3 are all the same, and the widths BWa, BWb, and BWc of the first light emitting area EA1 are the plurality of sub-pixels. (SP1, SP2, SP3) may be made differently. In this case, the width BWa of the first light emitting area EA1 of the first sub pixel SP1 is smaller than the width BWb of the first light emitting area EA1 of the second sub pixel SP2, and The width BWb of the first light emitting area EA1 of the pixel SP2 is smaller than the width BWc of the first light emitting area EA1 of the third sub-pixel SP3.

As the value obtained by dividing the widths BWa, BWb, and BWc of the first light emitting area EA1 by the widths OWa, OWb, and OWc of the concave portion increases, the distance between the first light emitting area EA1 and the second light emitting area EA2 increases. becomes closer, and the width of the first non-emission area NEA1 decreases. In addition, as the value obtained by subtracting the widths BWa, BWb, and BWc of the first light emitting area EA1 from the widths OWa, OWb, and OWc of the concave portion is smaller, the first light emitting area EA1 and the second light emitting area EA2 The distance between them decreases, and the width of the first non-emission area NEA1 decreases.

5 is a graph showing a change in luminance according to a viewing angle. Specifically, FIG. 5(a) shows the luminance change according to the viewing angle in the red sub-pixel, FIG. 5(b) shows the luminance change according to the viewing angle in the green sub-pixel, and FIG. 5(c) shows a luminance change according to a viewing angle in a blue sub-pixel. Here, the maximum wavelength of the light emitting element of the red sub-pixel was 624 nm and the half width was 26 nm. The maximum wavelength of the light emitting element of the green sub-pixel was 532 nm and the half width was 25 nm. The maximum wavelength of the light emitting element of the blue sub-pixel was 464 nm and the half width was 16 nm.

In Comparative Example 1, all of the red sub-pixel, green sub-pixel, and blue sub-pixel do not include side mirror-shaped anodes. That is, in the sub-pixel of Comparative Example 1, the overcoating layer did not include protrusions and was formed only with the base portion, and the anode was formed only with flat areas without including inclined areas. 1 μm, 1.5 μm, 2 μm, and 3 μm are distances between a first inclined surface, which is a side surface of a protrusion, and a third inclined surface, which is a side surface of a bank, in a sub-pixel including a side mirror-shaped anode. Hereinafter, for convenience of description, the distance between the first inclined surface and the third inclined surface is reduced and described as “distance”.

Referring to FIG. 5 , when the side mirror-shaped anode is included, the luminance viewing angle is improved in all sub-pixels compared to the case where the side mirror-shaped anode is not included. However, the distance having the best luminance and viewing angle characteristics is different for each sub-pixel. For example, in the red sub-pixel, the luminance viewing angle characteristic is the best when the distance is 1 μm, in the green sub-pixel, the luminance viewing angle characteristic is the best when the distance is 2 μm, and in the blue sub-pixel when the distance is 2 μm. The luminance and viewing angle characteristics are the best. In addition, the luminance value according to the viewing angle is different for each sub-pixel and distance. For example, based on a viewing angle of 30°, the luminance value of a red sub-pixel with a distance of 1 μm, the luminance value of a green sub-pixel with a distance of 2 μm, and the luminance value of a blue sub-pixel with a distance of 2 μm are all different. . If the luminance value of one sub-pixel is configured to be relatively higher or lower than the luminance values of other sub-pixels, a color shift may occur, causing a problem in that the color changes according to the viewing angle. For example, when the luminance value of a red sub-pixel is relatively high, the individual luminance viewing angle of the red sub-pixel itself may improve, but when a plurality of sub-pixels emit light together, a color shift occurs and the overall color viewing angle deteriorates. can

In the display device 100 according to an exemplary embodiment, the first distance d1 from the first sub-pixel SP1 is the second distance d2 from the second sub-pixel SP2 and the third sub-pixel It may be configured larger than the third distance d3 at (SP3). Also, the second distance d2 from the second sub-pixel SP2 may be greater than the third distance d3 from the third sub-pixel SP3. Accordingly, the luminance and viewing angle of the display device 100 may be improved and the occurrence of color shift may be minimized. Specifically, when the first distance d1 is the largest and the third distance d3 is the smallest among the first distance d1, the second distance d2, and the third distance d3, the sub-pixels SP1, SP2, SP3) Luminance values according to respective viewing angles may be similar. Accordingly, a color viewing angle may be improved by minimizing a color change depending on a viewing angle. Accordingly, display quality of the display device 100 may be improved by improving both the luminance viewing angle and the color viewing angle.

6 is a cross-sectional view of a display device according to another exemplary embodiment of the present invention. Since the display device 600 of FIG. 6 is substantially the same as the display device 100 of FIGS. 1 to 4 except for the distance between the side surface of the protrusion 132 and the side surface of the bank 650, redundant description will be made. should be omitted.

Referring to FIG. 6 , the display device 600 includes a first sub-pixel SP1 including a first light emitting element 140a emitting red light and a second light emitting element 140b emitting green light. A third sub-pixel SP3 including a second sub-pixel SP2 and a third light emitting element 140c emitting blue light is included.

In each of the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 , the distance between the side surface of the overcoating layer 130 and the side surface of the bank 650 may be configured to be different. Specifically, the distance between the side of the protrusion 132 and the side of the bank 650 may be configured differently for each of the plurality of sub-pixels SP1 , SP2 , and SP3 . For example, in the first sub-pixel SP1 , a side surface of the protrusion 132 and a side surface of the bank 650 may be spaced apart from each other by a first distance d1 . In the second sub-pixel SP2 , a side surface of the protrusion 132 and a side surface of the bank 650 may be spaced apart from each other by a second distance d2 . In the third sub-pixel SP3, a side surface of the protrusion 132 and a side surface of the bank 650 may be spaced apart from each other by a third distance d3.

The first distance d1 may be greater than the second distance d2 and the third distance d3. Also, the second distance d2 may be configured identically to the third distance d3. That is, among the first distance d1, the second distance d2, and the third distance d3, the first distance d1 is the largest, and the second distance d2 and the third distance d3 are identical. It can be. Thus, the width of the inclined region of the bank 650 is the largest in the first sub-pixel SP1 and the same in the second and third sub-pixels SP2 and SP3. In this case, the first distance d1 may be 2.5 μm or more. Also, the second distance d2 may be 1.5 μm to 2.5 μm. Also, the third distance d3 may be 1 μm to 2 μm.

The display device 600 according to another embodiment of the present invention can simultaneously improve the luminance viewing angle and the color viewing angle by appropriately adjusting the first distance d1 , the second distance d2 , and the third distance d3 . . Specifically, the light extraction efficiency may be improved and the luminance deviation according to the viewing angle may be improved through the side mirror-shaped first electrodes 141a, 141b, and 141c. In addition, when the first distance d1 is the largest among the first distance d1, the second distance d2, and the third distance d3, and the second distance d2 and the third distance d3 are the same, the sub Luminance values according to viewing angles of each of the pixels SP1 , SP2 , and SP3 may be similar. Accordingly, a color viewing angle may be improved by minimizing a color change depending on a viewing angle. Accordingly, display quality of the display device 600 may be improved by improving both the luminance viewing angle and the color viewing angle.

7 is a graph showing a change in luminance according to a viewing angle. Comparative Example 1 of FIG. 7 is the same as Comparative Example 1 of FIG. 5 . In Example 1 of FIG. 7 , the distance between the side of the protrusion of the red sub-pixel and the side of the bank is 3 μm, the distance between the side of the protrusion of the green sub-pixel and the side of the bank is 2 μm, and the blue The distance between the side of the protrusion of the sub-pixel and the side of the bank is 1.5 μm. The maximum wavelength and half width of the light emitting element of each sub-pixel were set to be the same as those set in FIG. 5 .

Table 1 shows the degree of luminance and color shift according to the viewing angle of Comparative Example 1 and Example 1. Here, the color shift is expressed as a JND value, and the JND is a numerical value representing a color change. Specifically, as the JND value increases, the user can more clearly perceive the color change.

viewing angle Comparative Example 1 Example 1 luminance 30° 78.5% (471 nits) 82.6% (496 nits) 45° 45.4% (272 nits) 53.2% (319 nits) 60° 22.4% (134 nits) 30.8% (185 nits) JND(Δu'v') 30° 4.5 (0.007) 4.4 (0.006) 45° 6.7 (0.009) 0.9 (0.001) 60° 12.1 (0.012) 8.5 (0.013)

Referring to FIG. 7 and Table 1, it can be seen that the luminance of Example 1 is improved compared to Comparative Example 1 at viewing angles of 30°, 45°, and 60°, respectively. Specifically, the luminance of Example 1 increased by approximately 5.3%, 17.3%, and 38.1% compared to the luminance of Comparative Example 1 at viewing angles of 30°, 45°, and 60°, respectively. Thus, Embodiment 1 can improve the deviation between the luminance from the front and the luminance from the side. That is, in Example 1, side visibility can be improved by improving the luminance viewing angle. In addition, referring to Table 1, it can be seen that the JND value of Example 1 is reduced compared to Comparative Example 1 at viewing angles of 30°, 45°, and 60°, respectively. In particular, in Example 1, the JND value significantly decreased at viewing angles of 45° and 60°. Therefore, in Example 1, the change between the color viewed from the front and the color viewed from the side can be improved. That is, in Example 1, the color viewing angle is improved, so display quality can be improved.

8 is a graph showing color shift according to a viewing angle. Specifically, FIG. 8(a) shows the color shift according to the viewing angle of Comparative Example 2, FIG. 8(b) shows the color shift according to the viewing angle of Comparative Example 3, and FIG. 8(c) shows the color shift according to the viewing angle of Example 1. 8(d) shows the color shift according to the viewing angle of Example 2. 8 shows color coordinates, which are not represented on the drawing, but the upper left part means green, the upper right part means yellow color, the lower right part means red color, and the lower left part means blue color. The spec line represents an optimal condition, and it can be determined that the color change is severe as the spec line deviates from the spec line. For example, if 70% exceeds the specification line, the user can more clearly perceive the change in color, so it can be judged as defective.

In Comparative Example 2, the distances between the side surfaces of the protrusions of the red sub-pixel, the green sub-pixel, and the blue sub-pixel and the side surfaces of the bank were all the same, 1.5 μm. In Comparative Example 3, the distance between the side of the protrusion of the red sub-pixel and the green sub-pixel and the side of the bank was 1 μm, and the distance between the side of the protrusion of the blue sub-pixel and the side of the bank was 3 μm. . Example 1 is the same as Example 1 of FIG. 7 . In Example 2, the distance between the side of the protrusion of the red sub-pixel and the side of the bank is 3 μm, the distance between the side of the protrusion of the green sub-pixel and the side of the bank is 2 μm, and the distance of the bank of the blue sub-pixel is 2 μm. The distance between the side of the protrusion and the side of the bank was configured to be 2 μm. The maximum wavelength and half width of the light emitting element of each sub-pixel were set the same as those set in FIG. 5 .

Referring to FIG. 8 , in Comparative Example 2 and Comparative Example 3, color shift occurred outside the specification line at viewing angles of 30°, 45°, and 60°. That is, as in Comparative Example 2, when the distance between the side of the protrusion and the side of the bank is the same for all red, green, and blue sub-pixels, it can be seen that the color shift occurs to a degree that the user clearly perceives. In addition, as in Comparative Example 3, when the distance between the side of the protrusion and the side of the bank in the blue sub-pixel among the red, green, and blue sub-pixels is the largest, it can be seen that the color shift occurs to the extent that the user clearly perceives it. . In the case of Example 1 and Example 2, the color shift is minimized compared to Comparative Example 2 and Comparative Example 3. In particular, since the degree of color shift is made to hardly deviate from the specification line, the user can hardly perceive or finely sense the color change according to the viewing angle. Therefore, when the first distance from the red sub-pixel is the largest and the third distance from the blue sub-pixel is the smallest among the red, green, and blue sub-pixels, the color shift according to the viewing angle is minimized and the color viewing angle is improved. It can be. Alternatively, when the first distance in the red sub-pixel among the red, green, and blue sub-pixels is the largest and the second distance and the third distance in the green and blue sub-pixels are the same, the color shift according to the viewing angle is minimized. and the color viewing angle can be improved.

A display device according to various embodiments of the present disclosure can be described as follows.

A display device according to an exemplary embodiment of the present invention includes a substrate including a plurality of sub-pixels; an over-coating layer disposed on the substrate and including a base portion and a protruding portion; a first electrode disposed to cover the base portion and the protruding portion; a bank disposed on a portion of the first electrode; an organic layer disposed on the first electrode and the bank; and a second electrode disposed on the organic layer, wherein a distance between a side surface of the protrusion and a side surface of the bank is configured to be different for each of the plurality of sub-pixels.

According to another feature of the present invention, the plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and a side surface of the protrusion of the first sub-pixel and a side surface of the bank are formed by the first sub-pixel. A side surface of the protrusion of the second sub-pixel and a side surface of the bank are spaced apart from each other to have a second distance, and a side surface of the protrusion of the third sub-pixel and a side surface of the bank have a third distance. can be spaced apart to have

According to another feature of the present invention, the first distance may be greater than the second distance and the third distance.

According to another feature of the present invention, the second distance may be greater than the third distance.

According to another feature of the present invention, the second distance may be the same as the third distance.

According to another feature of the present invention, the first distance may be 2.5 μm or more.

According to another feature of the present invention, the second distance may be 1.5㎛ to 2.5㎛.

According to another feature of the present invention, the third distance may be 1 μm to 2 μm.

According to another feature of the present invention, the first sub-pixel may be a red sub-pixel, the second sub-pixel may be a green sub-pixel, and the third sub-pixel may be a blue sub-pixel.

According to another feature of the present invention, the distance may be a distance in a direction parallel to the upper surface of the substrate.

A display device according to an exemplary embodiment of the present invention includes a substrate including a plurality of sub-pixels; an over-coating layer disposed on the substrate and including a base portion and a protruding portion; a first electrode disposed to cover the base portion and the protruding portion; a bank disposed on a portion of the first electrode; an organic layer disposed on the first electrode and the bank; and a second electrode disposed on the organic layer, wherein a width of the bank corresponding to a side surface of the protrusion is configured to be different for each of the plurality of sub-pixels.

According to another feature of the present invention, the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the width of the bank corresponding to the side surface of the protrusion may be the largest in the red sub-pixel. .

According to another feature of the present invention, the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and a width of the bank corresponding to a side surface of the protrusion may be the smallest among the blue sub-pixels. there is.

According to another feature of the present invention, the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and a width of the bank corresponding to a side surface of the protrusion is the green sub-pixel and the blue sub-pixel They may be identical to each other in pixels.

According to another feature of the present invention, the width of the bank may be a distance in a direction parallel to the upper surface of the substrate.

A display device according to an exemplary embodiment of the present invention includes a substrate including a plurality of sub-pixels; an overcoat layer disposed on the substrate and having a concave portion; a first electrode disposed to cover the concave portion; a bank exposing a portion of the first electrode through an opening area; an organic layer disposed on the first electrode; and a second electrode disposed on the organic layer, wherein at least two of the plurality of sub-pixels have different values obtained by subtracting the width of the opening from the width of the concave.

According to another feature of the present invention, the concave portion may include an inclined surface, and each of the plurality of sub-pixels may include a first light-emitting area corresponding to the opening area and a second light-emitting area corresponding to the inclined surface.

According to another feature of the present invention, at least two sub-pixels among the plurality of sub-pixels may have different distances between the first light-emitting region and the second light-emitting region.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100, 600: display device
110: substrate
111: buffer layer
112: gate insulating layer
113: interlayer insulating layer
114: passivation layer
120: transistor
121: active layer
122: gate electrode
123: source electrode
124: drain electrode
130: over coating layer
131: base part
132: protrusion
140a, 140b, 140c: light emitting element
141a, 141b, 141c: first electrode
142a, 142b, 142c: organic layer
143a, 143b, 143c: second electrode
150, 650: bank
SP, SP1, SP2, SP3: sub pixels
AA: display area
NA: non-display area
EA1: first light emitting area
EA2: second light emitting area
NEA1: first non-emission area
NEA2: second non-emission area
SLO1: first slope
SLO2: second slope
SLO3: third slope
d1: first distance
d2: second distance
d3: third distance

Claims (18)

a substrate including a plurality of sub-pixels;
an over-coating layer disposed on the substrate and including a base portion and a protruding portion;
a first electrode disposed to cover the base portion and the protruding portion;
a bank disposed on a portion of the first electrode;
an organic layer disposed on the first electrode and the bank; and
A second electrode disposed on the organic layer;
The display device of claim 1 , wherein a distance between a side surface of the protrusion and a side surface of the bank is configured to be different for each of the plurality of sub-pixels. According to claim 1,
The plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel;
A side surface of the protruding part of the first sub-pixel is spaced apart from a side surface of the bank to have a first distance;
A side surface of the protrusion of the second sub-pixel is spaced apart from a side surface of the bank to have a second distance;
A side surface of the protruding part of the third sub-pixel and a side surface of the bank are spaced apart from each other by a third distance. According to claim 2,
The first distance is greater than the second distance and the third distance. According to claim 2,
The second distance is greater than the third distance. According to claim 2,
The second distance is the same as the third distance, the display device. According to claim 2,
The first distance is 2.5 μm or more, the display device. According to claim 2,
The second distance is 1.5 μm to 2.5 μm, the display device. According to claim 2,
The third distance is 1 μm to 2 μm, the display device. According to claim 2,
The first sub-pixel is a red sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a blue sub-pixel. According to claim 1,
The distance is a distance in a direction parallel to the upper surface of the substrate, the display device. a substrate including a plurality of sub-pixels;
an over-coating layer disposed on the substrate and including a base portion and a protruding portion;
a first electrode disposed to cover the base portion and the protruding portion;
a bank disposed on a portion of the first electrode;
an organic layer disposed on the first electrode and the bank; and
A second electrode disposed on the organic layer;
The display device of claim 1 , wherein a width of the bank corresponding to a side surface of the protrusion is configured to be different for each of the plurality of sub-pixels. According to claim 11,
The plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel;
The width of the bank corresponding to the side surface of the protrusion is the largest in the red sub-pixel. According to claim 11,
The plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel;
A width of the bank corresponding to the side surface of the protrusion is the smallest among the blue sub-pixels. According to claim 11,
The plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel;
A width of the bank corresponding to a side surface of the protruding portion is equal to each other in the green sub-pixel and the blue sub-pixel. According to claim 11,
The width of the bank is a distance in a direction parallel to the upper surface of the substrate. a substrate including a plurality of sub-pixels;
an over-coating layer disposed on the substrate and having a concave portion;
a first electrode disposed to cover the concave portion;
a bank exposing a portion of the first electrode through an opening area;
an organic layer disposed on the first electrode; and
A second electrode disposed on the organic layer;
The display device of claim 1 , wherein at least two sub-pixels among the plurality of sub-pixels have different values obtained by subtracting a width of the opening area from a width of the concave portion. According to claim 16,
The concave portion includes an inclined surface,
The display device of claim 1 , wherein each of the plurality of sub-pixels includes a first emission region corresponding to the opening region and a second emission region corresponding to the inclined surface. According to claim 17,
The display device of claim 1 , wherein at least two sub-pixels among the plurality of sub-pixels have different distances between the first light-emitting region and the second light-emitting region.

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